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The Assyrians contaminated their enemies' water supply with a poison called Rye Ergot. The poison came from "skunk cabbage", which is a poisonous plant that grows near water.
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The Tartars hurled the corpses of people who died of a plague over the Kaffan walls. Historians say that this started the Black Death, or Bubonic Plague.
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The Germans started using Chlorine Gas and Mustard Gas.
